CN112818467B - Spot welding connection modeling method and system for automobile body-in-white - Google Patents
Spot welding connection modeling method and system for automobile body-in-white Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
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Abstract
The invention provides a spot welding connection modeling method and system for an automobile body in white, wherein the method comprises the following steps: importing and generating a white body three-dimensional model containing white body sheet metal parts and welding spot information, and acquiring assembly information of all assemblies in a white body three-dimensional model tree; performing for-loop traversal on all assemblies to obtain the welding level attribute of each assembly, and cutting the welding level attribute of each assembly to obtain the welding level number; storing the welding level number of each assembly into an assembly information list file, and acquiring the maximum welding level number; and performing for-cycle traversal on all the assemblies to obtain the welding level number of each assembly, and performing welding point modeling on all the assemblies from the assembly with the largest welding level number to the assembly with the largest welding level number in sequence. The spot welding connection modeling method for the white automobile body of the automobile shortens the modeling period, improves the modeling efficiency and ensures the modeling accuracy.
Description
Technical Field
The invention relates to the field of automobiles, in particular to a spot welding connection modeling method and system for an automobile body-in-white.
Background
The automobile body is an important component of an automobile, and the strength durability, NVH (noise, vibration and harshness) and collision safety performance of the automobile body determine the product quality of the automobile and also fundamentally determine whether the automobile body can be accepted by the market. In order to ensure the performance of the automobile body and the efficiency of product development, CAE performance simulation analysis is usually performed on the automobile structure, and CAE simulation analysis of the automobile body is a very important part in the development of automobile products.
The spot welding connection is the most main connection mode for ensuring the performance of the automobile body, however, the bearing type automobile body is generally formed by connecting 300-600 parts through 4500-6000 welding points, the process of connecting the automobile welding points with the automobile body is complex, the welding hierarchical relation is extremely complex, the manual construction of a white body finite element grid model is time-consuming and labor-consuming, and a CAE simulation engineer usually does not know the welding process relation, so that CAE welding point connection errors are easily caused, and the CAE simulation analysis accuracy cannot be ensured.
Disclosure of Invention
The invention aims to provide a spot welding connection modeling method for an automobile body-in-white, which aims to solve the problems that the existing method for manually building a finite element grid model of the body-in-white wastes time and labor, and CAE welding spot connection errors are easily caused, so that the CAE simulation analysis precision cannot be ensured.
The invention provides a spot welding connection modeling method of an automobile body in white, which comprises the following steps:
importing and generating a white body three-dimensional model containing white body sheet metal parts and welding spot information, and acquiring assembly information of all assemblies in a white body three-dimensional model tree;
performing for-loop traversal on all the assemblies to obtain the welding level attribute of each assembly, and cutting the welding level attribute of each assembly to obtain the welding level number;
storing the welding level number of each assembly into an assembly information list file, and acquiring the maximum welding level number;
and performing for-cycle traversal on all the assemblies, acquiring the welding level number of each assembly, and performing welding point modeling on all the assemblies from the assembly with the largest welding level number to the assembly with the largest welding level number in sequence.
The spot welding connection modeling method for the white automobile body of the automobile provided by the invention has the following beneficial effects:
the spot welding connection modeling method for the white automobile body of the automobile shortens the modeling period, improves the modeling efficiency and ensures the accuracy of modeling; the method comprises the steps of establishing correct welding relations among all assemblies of the white body by importing and generating a white body three-dimensional model containing white body sheet metal parts and welding spot information, acquiring assembly information of all the assemblies in a model tree, performing for-circulation traversal on all the assemblies to acquire the welding layer number of each assembly, establishing a correct welding sequence according to the welding layer number, and performing welding spot modeling on all the assemblies step by step according to the welding layer number sequence from large to small, namely performing modeling from bottom to top in sequence to simulate the actual welding process of the white body, so that the welding spot position can be ensured not to be wrong, and the correctness of welding spot modeling can be ensured.
In addition, the modeling method for the spot welding connection of the white automobile body of the automobile provided by the invention can also have the following additional technical characteristics:
further, the step of performing for-loop traversal on all the assemblies to obtain the welding level number of each assembly, and performing weld point modeling on all the assemblies in order from the largest welding level number to the smallest welding level number from the largest welding level number includes:
performing for-loop traversal on all the assemblies, judging the welding layer number of each assembly, if the welding layer number of the assemblies is equal to mx, displaying the assemblies with the welding layer number equal to mx on a preprocessing software interface, converting all geometric points in a welding spot file under the assemblies with the welding layer number equal to mx into first welding spots, and connecting other assemblies with the welding layer number equal to mx through the first welding spots, wherein mx is the maximum welding layer number;
performing for-loop traversal on all the assemblies, judging the welding layer number of each assembly, if the welding layer number of the assemblies is equal to mx-1, displaying the assemblies with the welding layer number equal to mx-1 on a preprocessing software interface, converting all geometric points in a welding point file of the assemblies with the welding layer number equal to mx-1 into second preset welding points, and connecting other assemblies with the welding layer number equal to mx-1 through the second preset welding points, wherein mx is the maximum welding layer number;
performing for-loop traversal on all the assemblies, judging the welding layer number of each assembly, if the welding layer number of the assemblies is equal to mx-2, displaying the assemblies with the welding layer number equal to mx-2 on a preprocessing software interface, converting all geometric points in a welding point file of the assemblies with the welding layer number equal to mx-2 into third preset welding points, and connecting other assemblies with the welding layer number equal to mx-2 through the third preset welding points, wherein mx is the maximum welding layer number;
and gradually modeling the welding spots according to the for circulation sequence until the assembly with the welding layer number of 0 is modeled.
Further, the step of importing and generating the white body three-dimensional model containing the white body sheet metal parts and the welding spot information comprises the following steps:
importing a two-dimensional model file containing automobile body-in-white sheet metal parts and welding spot information;
and performing middle surface extraction, automatic meshing and material thickness attribute endowment on all the sheet metal parts to generate a three-dimensional model file of a finite element.
Further, in the step of performing for-loop traversal on all the assemblies to obtain the welding level attribute of each assembly, and cutting the welding level attribute of each assembly to obtain the welding level number, the assembly with the welding level number i is composed of a plurality of assemblies with the welding level number i +1, the assembly with the welding level number 0 becomes the whole body-in-white assembly and is located at the top of the model tree, and the sheet metal part is the assembly with the largest welding level number and is located at the bottom of the model tree, wherein i is any welding level number.
The invention provides a spot welding connection modeling system of an automobile body in white, which comprises:
a first obtaining module: the white body three-dimensional model is used for importing and generating a white body three-dimensional model containing white body sheet metal parts and welding spot information, and acquiring assembly information of all assemblies in a white body three-dimensional model tree;
a second obtaining module: the system is used for performing for-cycle traversal on all the assemblies to obtain the welding level attribute of each assembly, and cutting the welding level attribute of each assembly to obtain the welding level number;
a third obtaining module: the system comprises an assembly information list file, a welding layer number acquisition module and a welding layer number acquisition module, wherein the assembly information list file is used for storing the welding layer number of each assembly into an assembly information list file and acquiring the maximum welding layer number;
a welding spot modeling module: the method is used for performing for-cycle traversal on all the assemblies, obtaining the welding level number of each assembly, and performing welding point modeling on all the assemblies from the assembly with the largest welding level number to the assembly with the largest welding level number in sequence.
The welding spot modeling module is further configured to perform for-loop traversal on all the assemblies, determine the welding level number of each assembly, if the welding level number of the assembly is equal to mx, display the assembly with the welding level number equal to mx on a pre-processing software interface, convert all geometric points in a welding spot file under the assembly with the welding level number equal to mx into a first welding spot, and connect other assemblies with the welding level number equal to mx through the first welding spot, where mx is the maximum welding level number;
performing for-loop traversal on all the assemblies, judging the welding layer number of each assembly, if the welding layer number of the assemblies is equal to mx-1, displaying the assemblies with the welding layer number equal to mx-1 on a preprocessing software interface, converting all geometric points in a welding point file of the assemblies with the welding layer number equal to mx-1 into second preset welding points, and connecting other assemblies with the welding layer number equal to mx-1 through the second preset welding points, wherein mx is the maximum welding layer number;
performing for-loop traversal on all the assemblies, judging the welding layer number of each assembly, if the welding layer number of the assemblies is equal to mx-2, displaying the assemblies with the welding layer number equal to mx-2 on a preprocessing software interface, converting all geometric points in a welding point file of the assemblies with the welding layer number equal to mx-2 into third preset welding points, and connecting other assemblies with the welding layer number equal to mx-2 through the third preset welding points, wherein mx is the maximum welding layer number;
and gradually modeling the welding spots according to the for circulation sequence until the assembly with the welding layer number of 0 is modeled.
Furthermore, the first acquisition module is also used for importing a two-dimensional model file containing automobile body-in-white sheet metal parts and welding spot information;
and performing middle surface extraction, automatic meshing and material thickness attribute endowing on all the sheet metal parts to generate a finite element three-dimensional model file.
Further, the assembly with the welding layer number of i is composed of a plurality of assemblies with the welding layer number of i +1, the assembly with the welding layer number of 0 is the whole body-in-white assembly and is located at the top of the model tree, the sheet metal part is the assembly with the largest welding layer number and is located at the bottom of the model tree, and i is any welding layer number.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
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The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of a first embodiment of a method for modeling a spot weld joint for an automotive body-in-white according to the present invention;
FIG. 2 is a three-dimensional model and a model tree structure of a body-in-white for a vehicle according to a first embodiment of the present invention;
FIG. 3 is an enlarged view of the model tree structure of FIG. 2;
FIG. 4 is a weld level property cut map of the first embodiment assembly of the present invention;
FIG. 5 is a weld level diagram of the first embodiment assembly of the present invention;
fig. 6 is a block diagram showing a spot welding connection modeling system of a vehicle body in white according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 1, a first embodiment of the present invention provides a method for modeling a spot welding connection of a body-in-white of an automobile, including steps S101 to S104.
S101, importing and generating a white body three-dimensional model containing white body sheet metal parts and welding spot information, and acquiring assembly information of all assemblies in the white body three-dimensional model tree.
The step of importing and generating the white body three-dimensional model containing the white body sheet metal parts and the welding spot information comprises the following steps:
importing a two-dimensional model file containing automobile body-in-white sheet metal parts and welding spot information;
and performing middle surface extraction, automatic meshing and material thickness attribute endowment on all the sheet metal parts to generate a three-dimensional model file of a finite element.
S102, performing for-loop traversal on all the assemblies to obtain the welding level attribute of each assembly, and cutting the welding level attribute of each assembly to obtain the welding level number.
In the step of performing for-loop traversal on all the assemblies to obtain the welding level attribute of each assembly, and cutting the welding level attribute of each assembly to obtain the welding level number, the assembly with the welding level number i is composed of a plurality of assemblies with the welding level number i +1, the assembly with the welding level number 0 is a whole body-in-white assembly and is located at the top of the model tree, and the sheet metal part is an assembly with the largest welding level number and is located at the bottom of the model tree, wherein i is any welding level number.
S103, storing the welding level number of each assembly into an assembly information list file, and acquiring the maximum welding level number.
And S104, performing for-loop traversal on all the assemblies, acquiring the welding level number of each assembly, and performing welding point modeling on all the assemblies from the assembly with the largest welding level number according to the sequence of the welding level numbers from large to small.
The step of performing for-loop traversal on all the assemblies to obtain the welding level number of each assembly, and performing welding point modeling on all the assemblies from the assembly with the largest welding level number to the assembly with the largest welding level number in sequence from the largest welding level number to the smallest welding level number comprises the following steps of:
performing for-loop traversal on all the assemblies, judging the welding layer number of each assembly, if the welding layer number of the assemblies is equal to mx, displaying the assemblies with the welding layer number equal to mx on a preprocessing software interface, converting all geometric points in a welding spot file under the assemblies with the welding layer number equal to mx into first welding spots, and connecting other assemblies with the welding layer number equal to mx through the first welding spots, wherein mx is the maximum welding layer number;
performing for-loop traversal on all the assemblies, judging the welding layer number of each assembly, if the welding layer number of the assemblies is equal to mx-1, displaying the assemblies with the welding layer number equal to mx-1 on a preprocessing software interface, converting all geometric points in a welding point file of the assemblies with the welding layer number equal to mx-1 into second preset welding points, and connecting other assemblies with the welding layer number equal to mx-1 through the second preset welding points, wherein mx is the maximum welding layer number;
performing for-loop traversal on all the assemblies, judging the welding layer number of each assembly, if the welding layer number of the assemblies is equal to mx-2, displaying the assemblies with the welding layer number equal to mx-2 on a preprocessing software interface, converting all geometric points in a welding point file of the assemblies with the welding layer number equal to mx-2 into third preset welding points, and connecting other assemblies with the welding layer number equal to mx-2 through the third preset welding points, wherein mx is the maximum welding layer number;
and gradually modeling the welding spots according to the for circulation sequence until the assembly with the welding layer number of 0 is modeled.
The realization process is as follows:
in this embodiment, the method specifically includes the following steps:
importing an assembly file containing a white body sheet metal part (sheet part) and a welding spot file (geometric point) into finite element preprocessing software; as shown in fig. 2, the left side is a model tree, the right side is a three-dimensional model of a body-in-white, each sub-assembly welded into the whole body-in-white is arranged under the model tree, each sub-assembly is composed of a next sub-assembly, and fig. 3 is a structure diagram of the model tree.
According to a general command of finite element preprocessing software, performing mid-plane extraction on all sheet metal parts, and automatically meshing and giving part material and material thickness attributes;
and acquiring all assemblies of the whole body-in-white according to the API (application programming interface) universal for the finite element pretreatment software, and acquiring all assembly lists assls based on the embedded API of the pretreatment software.
Traversing each assembly based on for circulation to obtain the welding level attributes of all the assemblies, cutting the welding level attributes (cutting symbols are /), then obtaining the number of the divided results, namely the welding level series, storing the welding level numerical values in a hierarchy List, wherein the welding level of the largest (in the example, Y5009000 assembly) assembly is 0, and adding 1 to the welding level of the next sub-assembly in sequence.
As shown in fig. 4, if the welding hierarchy attribute of the Y5120000 assembly is Y5009000/Y5009100/Y5120001/, and the result of Y5009000/Y5009100/Y5120001/cutting based on the symbol '/' is three character strings Y5009000, Y5009100 and Y5120001, the welding hierarchy of the Y5120000 assembly is 3, the assembly hierarchy of the Y5009100 is 1, and the assembly hierarchy of the Y5120001 is 2.
The same can obtain the level 3 of the Y5120500, Y5120600, Y5121000 and Y5122000 assemblies.
So a set of weld level results for the body-in-white assembly can be obtained:
hierarchyList＝[0,1,2,3,3,3,3,3]
and acquiring the maximum value of the welding layer series in the Hierarchylist list as mx being 3.
And performing double-cycle traversal based on the for command to obtain the welding layer number of each assembly, finding the assembly with the largest welding layer number, namely the bottommost sub-assembly, and welding all the assemblies step by step from the bottommost sub-assembly according to the welding layer number sequence from large to small.
The welding assembly in fig. 4, the first welding cycle, starting from welding level 3, will achieve welding in the first cycle, since the welding level of five assemblies Y5120500, Y5120600, Y5121000, Y5122000, Y5120000 is 3.
The second welding cycle, starting from Weld level 2, since the Y5120001 assembly has a Weld level of 2, the Y5120001 assembly will effect welding in the second cycle, wherein the Weld point information for the assembly is in the Y5120001-Weld document.
The third welding cycle, starting at welding level 1, since the welding level of the Y5009100 assembly is 1, the Y5009100 assembly will effect welding in the third cycle, with the Weld spot information for this assembly in the Y5009100-Weld file.
The fourth welding cycle, starting from welding level 0, since the Y5009000 assembly has a welding level of 0, the Y5009000 assembly will effect welding in the fourth cycle, with the Weld spot information for this assembly in the Y5009000-Weld file.
As shown in the welding hierarchical relation diagram of the assembly shown in FIG. 5, the sub-assembly sub 2-ass level sub-assembly is welded firstly, then the sub-assembly sub 1-ass level sub-assembly is welded, the sub0-ass level assembly is welded again, the actual welding process of the automobile body is simulated, and the welding hierarchical relation diagram is prevented from being wrong.
In conclusion, the spot welding connection modeling method for the white automobile body of the automobile has the advantages that: the spot welding connection modeling method for the white automobile body of the automobile shortens the modeling period, improves the modeling efficiency and ensures the accuracy of modeling; the method comprises the steps of establishing a correct welding relation among all assemblies of the body-in-white by introducing and generating a body-in-white three-dimensional model containing body-in-white sheet metal parts and welding spot information, acquiring the assembly information of all the assemblies in a model tree, performing for-loop traversal on all the assemblies to acquire the welding layer number of each assembly, establishing a correct welding sequence according to the welding layer number, and performing welding spot modeling on all the assemblies step by step according to the sequence of the welding layer numbers from large to small, namely modeling from bottom to top in sequence to simulate the actual welding process of the body-in-white, so that the welding spot position can be ensured not to be wrong, and the correctness of the welding spot modeling is ensured.
Referring to fig. 6, a second embodiment of the present invention provides a spot welding connection modeling system for a body-in-white of an automobile, including:
a first obtaining module: the white body three-dimensional model generating method is used for importing and generating a white body three-dimensional model containing white body sheet metal parts and welding spot information, and acquiring assembly information of all assemblies in the white body three-dimensional model tree.
The first acquisition module is also used for importing a two-dimensional model file containing automobile body-in-white sheet metal parts and welding spot information;
and performing middle surface extraction, automatic meshing and material thickness attribute endowing on all the sheet metal parts to generate a finite element three-dimensional model file.
A second obtaining module: the method is used for performing for-loop traversal on all the assemblies, obtaining the welding level attribute of each assembly, and cutting the welding level attribute of each assembly to obtain the welding level number.
The assembly with the welding layer number of i is composed of a plurality of assemblies with the welding layer number of i +1, the assembly with the welding layer number of 0 is the whole body-in-white assembly and is located at the top of the model tree, the sheet metal part is the assembly with the largest welding layer number and is located at the bottom of the model tree, and i is any welding layer number.
A third obtaining module: and the welding level number of each assembly is stored in an assembly information list file, and the maximum welding level number is obtained.
A welding spot modeling module: the method is used for performing for-cycle traversal on all the assemblies, obtaining the welding level number of each assembly, and performing welding point modeling on all the assemblies from the assembly with the largest welding level number to the assembly with the largest welding level number in sequence.
The welding spot modeling module is further used for performing for-loop traversal on all the assemblies, judging the welding level number of each assembly, if the welding level number of the assemblies is equal to mx, displaying the assemblies with the welding level number equal to mx on a preprocessing software interface, converting all geometric points in a welding spot file under the assemblies with the welding level number equal to mx into first welding spots, and connecting other assemblies with the welding level number equal to mx through the first welding spots, wherein mx is the maximum welding level number;
performing for-loop traversal on all the assemblies, judging the welding layer number of each assembly, if the welding layer number of the assemblies is equal to mx-1, displaying the assemblies with the welding layer number equal to mx-1 on a preprocessing software interface, converting all geometric points in a welding point file of the assemblies with the welding layer number equal to mx-1 into second preset welding points, and connecting other assemblies with the welding layer number equal to mx-1 through the second preset welding points, wherein mx is the maximum welding layer number;
performing for-loop traversal on all the assemblies, judging the welding layer number of each assembly, if the welding layer number of the assemblies is equal to mx-2, displaying the assemblies with the welding layer number equal to mx-2 on a preprocessing software interface, converting all geometric points in a welding point file of the assemblies with the welding layer number equal to mx-2 into third preset welding points, and connecting other assemblies with the welding layer number equal to mx-2 through the third preset welding points, wherein mx is the maximum welding layer number;
and gradually modeling the welding spots according to the for circulation sequence until the assembly with the welding layer number of 0 is modeled.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the present invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. A spot welding connection modeling method of an automobile body in white is characterized by comprising the following steps:
importing and generating a white body three-dimensional model containing white body sheet metal parts and welding spot information, and acquiring assembly information of all assemblies in a white body three-dimensional model tree;
performing for-loop traversal on all the assemblies to obtain the welding level attribute of each assembly, and cutting the welding level attribute of each assembly to obtain the welding level series;
storing the welding level number of each assembly into an assembly information list file, and acquiring the maximum welding level number;
performing for-loop traversal on all the assemblies, acquiring the welding level number of each assembly, and performing welding point modeling on all the assemblies from the assembly with the largest welding level number to the assembly with the largest welding level number in sequence;
the step of performing for-loop traversal on all the assemblies, acquiring the welding level number of each assembly, and performing welding point modeling on all the assemblies from the assembly with the largest welding level number to the assembly with the largest welding level number in sequence from the largest welding level number to the smallest welding level number comprises the following steps:
performing for-loop traversal on all the assemblies, judging the welding layer number of each assembly, if the welding layer number of the assemblies is equal to mx, displaying the assemblies with the welding layer number equal to mx on a preprocessing software interface, converting all geometric points in a welding spot file under the assemblies with the welding layer number equal to mx into first welding spots, and connecting other assemblies with the welding layer number equal to mx through the first welding spots, wherein mx is the maximum welding layer number;
performing for-loop traversal on all the assemblies, judging the welding layer number of each assembly, if the welding layer number of the assemblies is equal to mx-1, displaying the assemblies with the welding layer number equal to mx-1 on a preprocessing software interface, converting all geometric points in a welding point file of the assemblies with the welding layer number equal to mx-1 into second preset welding points, and connecting other assemblies with the welding layer number equal to mx-1 through the second preset welding points, wherein mx is the maximum welding layer number;
performing for-loop traversal on all the assemblies, judging the welding layer number of each assembly, if the welding layer number of the assemblies is equal to mx-2, displaying the assemblies with the welding layer number equal to mx-2 on a preprocessing software interface, converting all geometric points in a welding point file of the assemblies with the welding layer number equal to mx-2 into third preset welding points, and connecting other assemblies with the welding layer number equal to mx-2 through the third preset welding points, wherein mx is the maximum welding layer number;
and gradually modeling the welding spots according to the for circulation sequence until the assembly with the welding layer number of 0 is modeled.
2. The method for modeling a spot weld connection of an automotive body-in-white according to claim 1, wherein the step of importing and generating a three-dimensional model of the body-in-white containing body-in-white sheet metal parts and weld spot information comprises:
importing a two-dimensional model file containing automobile body-in-white sheet metal parts and welding spot information;
and performing middle surface extraction, automatic meshing and material thickness attribute endowing on all the sheet metal parts to generate a finite element three-dimensional model file.
3. The method for modeling the spot welding connection of the white body of the automobile according to claim 1, wherein in the step of performing for-loop traversal on all the assemblies to obtain the welding level attributes of each assembly, and cutting the welding level attributes of each assembly to obtain the welding level progression, the assembly with the welding level progression i is composed of a plurality of assemblies with the welding level progression i +1, the assembly with the welding level progression 0 is the whole white body assembly and is positioned at the top of the model tree, and the sheet metal part is the assembly with the largest welding level progression and is positioned at the bottom of the model tree, wherein i is any welding level progression.
4. A spot weld connection modeling system for automotive body-in-white, comprising:
a first obtaining module: the system comprises a three-dimensional model tree, a three-dimensional model of the white body and a welding spot, wherein the three-dimensional model tree is used for importing and generating a three-dimensional model of the white body containing a sheet metal part of the white body and welding spot information and acquiring assembly information of all assemblies in the three-dimensional model tree of the white body;
a second obtaining module: the system is used for performing for-cycle traversal on all the assemblies to obtain the welding level attribute of each assembly, and cutting the welding level attribute of each assembly to obtain the welding level number;
a third obtaining module: the system comprises a welding level number acquisition module, a welding level number generation module and a welding level number generation module, wherein the welding level number generation module is used for storing the welding level number of each assembly into an assembly information list file and acquiring the maximum welding level number;
a welding spot modeling module: the assembly welding modeling system is used for performing for-cycle traversal on all assemblies, acquiring the welding level number of each assembly, and performing welding spot modeling on all the assemblies from the assembly with the largest welding level number according to the welding level number sequence from the largest to the smallest;
the welding spot modeling module is further used for performing for-loop traversal on all the assemblies, judging the welding level number of each assembly, if the welding level number of the assemblies is equal to mx, displaying the assemblies with the welding level number equal to mx on a preprocessing software interface, converting all geometric points in a welding spot file under the assemblies with the welding level number equal to mx into first welding spots, and connecting other assemblies with the welding level number equal to mx through the first welding spots, wherein mx is the maximum welding level number;
performing for-loop traversal on all the assemblies, judging the welding layer number of each assembly, if the welding layer number of the assemblies is equal to mx-1, displaying the assemblies with the welding layer number equal to mx-1 on a preprocessing software interface, converting all geometric points in a welding point file of the assemblies with the welding layer number equal to mx-1 into second preset welding points, and connecting other assemblies with the welding layer number equal to mx-1 through the second preset welding points, wherein mx is the maximum welding layer number;
performing for-loop traversal on all the assemblies, judging the welding layer number of each assembly, if the welding layer number of the assemblies is equal to mx-2, displaying the assemblies with the welding layer number equal to mx-2 on a preprocessing software interface, converting all geometric points in a welding point file of the assemblies with the welding layer number equal to mx-2 into third preset welding points, and connecting other assemblies with the welding layer number equal to mx-2 through the third preset welding points, wherein mx is the maximum welding layer number;
and gradually modeling the welding spots according to the for circulation sequence until the assembly with the welding layer number of 0 is modeled.
5. The system according to claim 4, wherein the first obtaining module is further configured to import a two-dimensional model file containing automobile body-in-white sheet metal parts and welding spot information;
and performing middle surface extraction, automatic meshing and material thickness attribute endowing on all the sheet metal parts to generate a finite element three-dimensional model file.
6. The system according to claim 4, wherein the assembly with the number of welding levels i is composed of a plurality of assemblies with the number of welding levels i +1, the assembly with the number of welding levels 0 is the whole body-in-white assembly and is located at the top of the model tree, and the sheet metal part is the assembly with the largest number of welding levels and is located at the bottom of the model tree, wherein i is any number of welding levels.
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